linux-kernel - Re: [PATCH 1/6] x86: Change get_max

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Message-ID: <AANLkTi=NU1UM3N6bbPSqqS+7UbvTY6YDNyn2s4tKURMY@mail.gmail.com>
Date:	Wed, 29 Dec 2010 15:37:16 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/6] x86: Change get_max_mapped() to inline

On Wed, Dec 29, 2010 at 3:30 PM, Yinghai Lu <yinghai@...nel.org> wrote:

>>> Index: linux-2.6/arch/x86/include/asm/page_types.h
>>> ===================================================================
>>> --- linux-2.6.orig/arch/x86/include/asm/page_types.h
>>> +++ linux-2.6/arch/x86/include/asm/page_types.h
>>> @@ -45,6 +45,11 @@ extern int devmem_is_allowed(unsigned lo
>>>  extern unsigned long max_low_pfn_mapped;
>>>  extern unsigned long max_pfn_mapped;
>>>
>>> +static inline u64 get_max_mapped(void)
>>> +{
>>> +     return (u64)max_pfn_mapped<<PAGE_SHIFT;
>>> +}
>>> +
>>>  extern unsigned long init_memory_mapping(unsigned long start,
>>>                                        unsigned long end);
>>>
>>
>
>> Furthermore, it seems to me that it would make more
>> sense for this to be phys_addr_t instead of u64; would you agree?
>
> yes.

or could just use unsigned long instead.

on 32bit it will be under 4g
on 64bit unsigned long  is 64bit already.

Thanks

Yinghai
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